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A173556 as a triangular array

1
24
400
6404
24044
400000
0000000
24044004
640440044
4000000000
64044004404
400000000000
0000000000000
24044004404004
6

A173556 as a square array

124624026464026
4044004404004
000000000000
44004404004
4004404004
000000000
00000000
4404004
404004
00000
4004
000
00
4
124624026464026
4044004404004
000000000000
44004404004
4004404004
000000000
00000000
4404004
404004
00000
4004
000
00
4